/*
 * Copyright [2021] [MaxKey of copyright http://www.maxkey.top]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package org.maxkey.web;

import java.io.IOException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;

import org.maxkey.constants.ContentType;
import org.springframework.stereotype.Component;

@Component
public class HttpResponseAdapter {


    public void setContentType(
            HttpServletResponse response,
            String format) {

        if (format == null || format.equalsIgnoreCase("") || format.equalsIgnoreCase(HttpResponseConstants.FORMAT_TYPE.XML)) {
            response.setContentType(ContentType.APPLICATION_XML_UTF8);
        } else {
            response.setContentType(ContentType.APPLICATION_JSON_UTF8);
        }
    }

    public void write(HttpServletResponse response, String content, String format) {

        setContentType(response, format);

        // Set to expire far in the past.
        response.setDateHeader("Expires", 0);
        // Set standard HTTP/1.1 no-cache headers.
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
        // Set IE extended HTTP/1.1 no-cache headers (use addHeader).
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");

        ServletOutputStream out = null;
        try {
            out = response.getOutputStream();
            // write the data out
            out.write(content.getBytes());
            out.flush();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}
